March 14, 2011, 11:30pm Japan Nuclear Facility Updates – Unit 2 Ex Vessel Fuel Damage – Substantial Debris in Unit 3 SFP

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From: Dentel, Glenn
Sent: Tuesday, March 15, 2011 12:12 AM
To: Dean, Bill; Lew, David; Wilson, Peter; Roberts, Darrell; Collins, Daniel; Lorson, Raymond; Baker, Pamela;
Walker, Tracy; Sunil.Weerakoddyv(nrc.gov; Clifford, James; Miller, Chris
Cc: Screnci, Diane; Sheehan, Neil; Trapp, James; McNamara, Nancy; Tifft, Doug; Hansell, Samuel; Hinson,
Felicia; raymond.McKinelyvcnrc.qov; Dentel, Glenn
Subject: March 14, 2011, 11:30pm Japan Nuclear Facility Updates

Update regarding Japan from 1130 pm TA briefing,

Conditions have substantially changed

Fukushima Daiichi
Unit 1 has stable core cooling and intact containment with no SFP issues

Unit 2 has not had core cooling for some time, apparently the pumps were deadheaded. Containment is no longer believed to be intact (They heard a loud explosion in containment and containment pressure reduced to atmospheric pressure). There is possibility of ex vessel fuel damage.

Unit 3 has stable core cooling, there is substantial debris in the SFP from earlier hydrogen explosion

Unit 4 SFP is dry. Potential fuel pool zirconium fire.

20 km evalucuation has been issue by Japan and 30 km shelter in place.

Site Boundary dose rates at Units 1/2 is 3 to 4 R/hr at Units 3/4 is 10 R/hr

NRC has dispatched 9 individuals to Japan lead by Chuck Casto DOE WRAP team is 7 hours out from arrival in Japan.

Next Update is at 0730.

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March 15th, 2011 – All 3 Reactors have known fuel damage – 50 Staff on site – 5 may have received fatal radiation doses

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March 15th 2011 – Unit 2 Containment Probably Breached – Loud Explosion – Containment Pressure Drop – Radiation Spike – Spent Fuel Fire

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